Diffusion

In the left illustration, we show an array of flat panels 1m wide and 1.25 m apart, along with the source and the receiver arc. In the middle illustration, we show the far field response along the receiver arc for this flat panel array. Periodicity lobing at +/- 530 at mid frequencies (dark line) is evident. High frequencies (light line) are purely specular and low frequencies (dashed line) are omnidirectional for this panel size. On the right, the response for an array of semicylinders of the same size is shown at mid frequency (light line), illustrating the dispersing effect of the semicylinders. Periodicity lobing, however, is still present. The response of an aperiodic semicylinder array is also shown (dark line) to illustrate the improvement modulation provides.